A hidden alley in urban Baltimore is a haven for graffiti artists.

The trials and tribulations of marking Poe's grave.

The crown jewel of the Queens Museum is a nearly 10,000-square-foot architectural model of the city originally built for the 1964 World's Fair.

This abandoned seaside fortress is now simply an imposing ruin being taken back by nature.

Phil Mortillaro uses keys to bring art back to the Village.

Homemade rockets, dinosaurs, and robots make this New York small business much more than a furniture store.

A small peaceful park and waterfall tucked amid the urban grind of Midtown Manhattan.

Sniff the Titan Arum's rotting flesh.

12,000 sq. ft. museum tracing erotic art from antiquity to modern times.

The "Seinfeld" diner.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

A museum and shop on Bourbon Street located in the former home of the second Voodoo Queen of New Orleans.

This symbolic piece of New Orleans architecture is also home to a few ghastly stories.

World Trade Center memorial likened to a woman's sexual organ.

An annual extravaganza of Broadway theater memorabilia.

This exemplar of modernist architecture is meant to captivate and inspire students of the Cooper Union.

A bit of retro transportation flair preserved in the world's largest department store.

An artist's cute bronze subway sculptures belie his violent artistic past.

This mosaic dedicated to John Lennon was tended for years by a Beatles super-fan.

A room in New York City that contains 250 cubic yards of dirt worth a million dollars.

Read a book next to a Midtown waterfall.

Elevated freight railway turned wildly successful urban park.

Metro station with a claim to rock n' roll fame.

Cold war icon and onetime "hole" in the iron curtain.